Process for the preparation of 4-fluorophthalic anhydride

Details Process for the preparation of 4-fluorophthalic anhydride Process for the preparation of 4-fluorophthalic anhydride

Category

C - Chemistry, Metallurgy

Subcategory

07

Subsubcategory

D

CPC

260/364.8

IPC codes

C07D 307/89 (2006.01) B01J 23/40 (2006.01)

Type

Patent

Patent number

CA 1235422

Description

PROCESS FOR THE PREPARATION OF 4-FLUOROPHTHALIC ANHYDRIDE ABSTRACT OF THE DISCLOSURE This invention relates to a process for the preparation of 4-fluorophthalic anhydride which comprises contacting a dihalohexahydrophthalic anhydride of the formula Image where X is Cl or F, with a dehydrogenation catalyst. Advantageously, the process of the invention may be carried out in the presence of a hydrogen acceptor. The preferred hydrogen acceptor is a halocarbon hydrogen acceptor of the formula Image where Y is Cl, Br, or I; Z is Cl, Br or I; m is 0 to 4, n is 0 to 3, p is 0 to 3, and m + n is at least 1; with the proviso that when m is 0, p is at least 1.

Application Number

453958

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